| Brand | ROCKWILL |
| Model NO. | 12kV 13.2kV 36kV 38kV 40.5kV 72.5kV 145kV High Performers Dead Tank circuit breaker |
| Rated voltage | 252kV |
| Rated normal current | 4000A |
| Rated frequency | 50/60Hz |
| Rated short circuit breaking current | 50kA |
| Series | LW58A |
Product introduction
As China's first source factory specializing in GIS tank circuit breakers, we hold a pioneering position in the industry with decades of accumulated technical experience. Leveraging advanced R&D capabilities and mature manufacturing technologies, our products are widely recognized for their market-leading reliability and performance.
LW58A-40.5/72.5/138/145/252 Dead Tank circuit breaker is a new generation of open high-voltage electrical equipment developed independently ,The tank type circuit breaker is composed of the entrance bushing, lead-out bushing, CT, arc extinguishing chamber, chassis, operating mechanism, etc. It can be used in the high-cold and high-altitude area, At present, the new generation of tank products have reached the leading domestic and international advanced level in advanced technology and quality reliability.
Main characteristic
Good anti-seismic performance, the product is equivalent to the seismic grade of GlS.
（a）Horizontal arrangement of arc extinguishing chamber, low center of gravity.
（b）Auto seismic frequency: The porcelain column breaker is about 4.5 Hz, and the tank circuit breaker is about 13.5 Hz.
The electric tracing band solution can be used in the high-cold region, which can not be realized by the porcelain column circuit breaker.
The product can be used in an area of 5000m , the standard configuration of the arc extinguishing chamber & drive system can only be fixed with the height of the outlet casing.
The tank type circuit breakers integrates the straight through current transformer, the product covers a small area the quality is stable, and the on-site maintenance work is small. At the same time, it solves the problems such as the small margin of CT insulation ,the limitation of CT capacity and the high cost ,aging, cracking and explosion of the CT.
Design of an arc extinguishing chamber：Horizontal Structure, it adopts thermal expansion and auxiliary pressure gas extinguishing technology, which has small operation work, excellent breaking performance and more than 20 electrical life.
Environment adaptability:It is suitable for severe environment conditions (such as severe pollution, water fog, hall, etc.), high - altitude area, high altitude area, earthquake area, the box body is sealed with air bag type, and the body protection grade is lP66.
The CT of variable ratio and multi-level combination can be attached, high accuracy, easy to add capacity, and meet 80% or the operating frequency voltage under the value of 5Pc, can be configured with TPY.
Complete CT protection measures: CT shell is sealed at both ends of the shell and has special ant-condensation design.
The light spring operating mechanism adopts the overall cast aluminum frame. Breaking spring , closing spring and buffer are arranged in a centralized manner, and all adopt spiral double pressure spring, compact structure, not easy to fatigue.
The product is small, with integrated design, integrated supply, integrated installation conditions.
With the breaking capacity of the 4000A back-to-back capacitor bank.
Main technical parameters
Among these, some SF6 tank circuit breakers cover non-standard voltage levels including Customizable Voltage Ratings: 3.6kV, 4.76kV, 7.2kV, 8.25kV, 11kV, 12kV, 13.2kV, 13.8kV, 15kV, 15.5kV, 17.5kV, 22kV, 22.9kV, 24kV, 25.8kV, 27kV, 33kV, 36kV, 38kV, 40.5kV, 44kV, 60kV, 63kV, 66kV, 69kV, 88kV, 115kV, 123kV, 125kV, 126kV, 132kV, 138kV, 145kV, 150kV, 170kV, 184kV, 204kV, 220kV, 225kV, 230kV, 245kV, 275kV, 330kV, 345kV, 400kV, 765kV, 800kV with a rated short-circuit breaking current of 50kA or 63kA, and we offer customization services.
|
NO |
Name |
Unit |
Data |
|||||
|
1 |
Rated voltage |
kV |
40.5 |
72.5 |
145 |
252 |
||
|
2 |
Operational altitude |
M |
≤5000 |
|||||
|
3 |
Operating ambient temperature |
℃ |
-40~55 |
|||||
|
4 |
Operating pollution class |
Class |
Ⅳ |
|||||
|
5 |
Wind speed resistance |
m/s |
34 |
|||||
|
6 |
Aseismatic class |
AG5 |
||||||
|
7 |
1min rated power frequency withstand voltage (r.m.s) |
Phase to earth |
kV |
95 |
160 |
275 |
552 |
|
|
Across isolating distance |
kV |
118 |
160（+42） |
315 |
552（+175.2） |
|||
|
8 |
Rated lightning impulse withstand voltage (peak) |
Phase to earth |
kV |
185 |
380 |
650 |
1260 |
|
|
Across isolating distance |
kV |
215 |
380（+59） |
750 |
1260（+247.2） |
|||
|
9 |
Rated frequency |
HZ |
50 |
50/60 |
50 |
50/60 |
||
|
10 |
Rated current |
A |
2500/3150/4000 |
2500/3150/4000 |
3150 |
4000 |
||
|
11 |
Rated short-time withstand current (r.m.s) |
kA |
31.5 |
40 |
40 |
40 |
50 |
|
|
12 |
Rated short-circuit withstand time |
S |
4 |
|||||
|
13 |
Coefficient of opening pole |
1.5 |
1.3/1.5 |
1.3/1.5 |
1.3 |
|||
|
14 |
Electrical life |
Times |
22 |
|||||
|
15 |
Rated SF6 gas pressure（20℃） |
MPa |
0.45 |
0.4 |
0.6 |
0.6 |
||
|
16 |
Mechanical life |
Times |
10K |
|||||
Order Notice:
Model and format of circuit breaker.
Rated electrical parameters (voltage, current, break current, etc).
Working conditions for using (environment temperature, altitude, and environment pollution level).
Operating voltage of operating mechanism and motor voltage.
The number of current transformer, current ratio, class combination and secondary load.
Names and quantities of spare items needed, parts and special equipment and tools(to be otherwise ordered).
145kV is a mainstream standard grade in China, 138kV is an American standard specification, and 252kV is suitable for higher-voltage scenarios. Core differences and selection points: ① Insulation and parameters — the break spacing and rated SF6 pressure (0.7MPa) of 252kV are both higher than the other two; 138kV and 145kV can share some structures but require adjustment of the voltage sampling threshold; ② Key selection points — 138kV prioritizes matching interfaces of imported equipment, 145kV focuses on maturity, and 252kV needs to verify the breaking capacity of ≥63kA and the insulation coordination test report.
During the normal operation and interruption processes of a circuit breaker, SF₆ gas can decompose, producing various decomposition products such as SF₄, S₂F₂, SOF₂, HF, and SO₂. These decomposition products are often corrosive, toxic, or irritating, and therefore require monitoring.If the concentration of these decomposition products exceeds certain limits, it may indicate abnormal discharges or other faults within the arc quenching chamber. Timely maintenance and handling are necessary to prevent further damage to the equipment and to safeguard personnel health.
The leakage rate of SF₆ gas must be controlled at an extremely low level, typically not exceeding 1% per year. SF₆ gas is a potent greenhouse gas, with a greenhouse effect 23,900 times that of carbon dioxide. If a leak occurs, it can not only cause environmental pollution but also lead to a decrease in the gas pressure within the arc quenching chamber, affecting the performance and reliability of the circuit breaker.
To monitor the leakage of SF₆ gas, gas leakage detection devices are typically installed on tank-type circuit breakers. These devices help to promptly identify any leaks so that appropriate measures can be taken to address the issue.
Integral Tank Structure: The breaker's arc quenching chamber, insulating medium, and related components are sealed within a metal tank filled with an insulating gas (such as sulfur hexafluoride) or insulating oil. This forms a relatively independent and sealed space, effectively preventing external environmental factors from affecting the internal components. This design enhances the insulation performance and reliability of the equipment, making it suitable for various harsh outdoor environments.
Arc Quenching Chamber Layout: The arc quenching chamber is typically installed inside the tank. Its structure is designed to be compact, enabling efficient arc quenching within a limited space. Depending on different arc quenching principles and technologies, the specific construction of the arc quenching chamber may vary, but generally includes key components such as contacts, nozzles, and insulating materials. These components work together to ensure that the arc is quickly and effectively extinguished when the breaker interrupts the current.
Operating Mechanism: Common operating mechanisms include spring-operated mechanisms and hydraulic-operated mechanisms.
Spring-Operated Mechanism: This type of mechanism is simple in structure, highly reliable, and easy to maintain. It drives the opening and closing operations of the breaker through the energy storage and release of springs.
Hydraulic-Operated Mechanism: This mechanism offers advantages such as high output power and smooth operation, making it suitable for high-voltage and high-current class breakers.
